Hydraulic-hoist heater



Dec. M, 1923,.- Lm' G. A. woon HYDRAULI C HO I S T HEATER Filed March l51920 Y l/ IW 'Wl @E I CU.

, l SMI/UMNO@ @argelcl WOO fbko'zfl/m 'suchas an e Patented Dec. 11,1923.

UNITED #STATES PATENT oEFlcE.

GARFIELD A. woon, or ALGONAC, MICHIGAN.

HYDRAULICf-HOIST HEATER.

lApplication filed Marohf15, 1920. serial No. 366,102.

the following isa specification.

As is a matter of common knowledge, the device most used for tilting thebodies of self-propelled vehicles is the hydraulic hoist the cylinder orcylinders of which are differently arranged in the variousconstructions. For example, in the most usual type the cvlinder isupright, being positioned forwardly -of the body, 4while in other casesthe cylinder or cylinders is placed below the body and arranged eithersubstantially horizontally or in upright fashion. In each instance oilis the pressure fluid generally. employed, but some difficultyisexperienced in the colder weather on account of the fact that oil ofthe proper consistency to prevent freezing does not flow freely' throughthe pump and associated passages1 particularly when the hoist has notbeen usedfor several hours. The resulting friction of `course involvessome loss of power, and difficulty is sometimes experienced in that thebody fails to settle of its o wn accord after the load has beendischarged.

These objections I overcome by the present invention which providesmeans under control of the driverl for applying heat, preferably wasteheat from the engine, to the circulatory 1i uidto insure the desirablefree-flowing-con ition. It will be understood that an well-known heatingelement lhctri'c coil or grid might be used, but I prefer to take theheat from the exhaust gases, and for this purpose If pre-4 ferablyattach to the exhaust pipe a valvecontrolled hose Vconnection leading toa jacket element preferably surrounding a portion of the hoistingcylinder. Other hot engine fluids such as the cooling liquid or airmightbe utilized for the same general purpose, but AI prefer to use theexhaust gases for obvious vreasons.

f- A more specific object of the invention is to provide apparatus forthe purpose stated of such nature as to be readily appliedto existingconstructions, but the jacket may be built as a permanent part of theinitial truck construction if desired.

Another 'object is` to `provide apparatus for the purpose' vstated.wherein one main element may be applied to the engine. and

another to the hoist, and wherein said elements are joined by a fluidtransmitting connection which need .not be cut to correspond to thedifferent relative locations of said elements in the trucks of differentmanufactures.

A further object is to devise an inexpensive apparatus for the purposeset forth.

In the drawings: A

Fig. 1 is a side view,parts being omitted,

showing the preferred manner of applying the invention to a truckwherein the hoist.

is of the upright type 'positioned'forwardly' of the body. Fig. 2isasection on line 2-2 of Fig. 1, the piston being elevated.

Fig. 3 is an-enlarged horizontal section corresponding to Fig. 2, and

Fig. 4 is a view corresponding to Fig. 3 andtaken from the righ-t handend thereof. 1 indicates the wheels and 2 the frame of an ordinary truckwhereon the body 3 may be tilted when the piston and cross-'barconstruction 4 is elevated in the cy1inder`5 as explained' in my 4PatentNo. 1,271,969,

granted July 9, 1918. A more detailed description of the apparatus isnot thought necessary, but it will be observed that the base castinframe 'or ars 7 centrally of the vehicle.

6 of the hoist rests onthe cross- The usual exhaust pipe and muiierforthe internal combustion propelling engine 8 ap` pear at 9 and 10,respectively; and pumping apparatus (not shown) driven by theV engine isprovided for forcing the working fluid between the base' and the pistonto elevate the latter in the general manner in'- dicated in said patent.

In accordance with thev invention I preferably provide the section 11ofthe exhaustv pipebeyond the muliier with a lateral opening 12 andsecure' around this opening as by means ofthe U-bolts 13, a fitting 14to which one end of the hose or flexible conduit or tube 15 isattached,the opposite end leading into a acket for the lower end-portion of thecylinder. This' jacket may be formed in various ways, either'permanentlywith the basel orotherwise, and in the embodiment shown it comprises twosections 16-17 bolted together at 18, the section 16 having an internalrib 19 extending longitudinally of the cylinder and being provided withan outlet opening. o r openings 20.- There is thus formed a jacketchamber through which ezthaust gases 'from the hose 15 pass in themanner indicated bythe arrows in Fig". 2 to heat the oil or other liquidWithin the cylinder.,

` valves or the equivalent may be constructed,

positioned and operated in various Ways and the particular showing ismerely by Way of example.

During cold Weather the driver sets the gate or gates the Working liquidat the proper temperature to rvinsure free-flowing, but in Warm Weatherthe better practice is to close od the conduit 15 altogether, but theparts may be so constructed 'or adjusted that a small pro# portion ofthegases'will pass through thek jacket 16-17 under -all circumstances.The

device 1s inexpensive and in the embodiment shown may be readilyinstalled on existing equipment. It is evident that various otherdevices utilizing heat developed by or traceable rt-'o the propellingengine or power plant may be used, but 1 re ard my mvention'ias'including an even broa er conception in that l regard myself as the'first'to employ any heating apparatus-portable with the vehicle forheating the Working fluidnpf the hoist at Will. hydraulic hoist may in;some instances. be used for purposes other than the tilting of a body onthe truck. The flexibility of the conduit 15 permits the baseA 6 to sinksomewhat as theload is applied Without applying stressto the exhaustpipe 11 and moreover provides Jfor ready adaptation of the device toinstallations wherein the relative in such manner as'to maintain.`

It Will Ybe evident further that the :navega-'e location orn the exhaustline and the hoist varies to a considerable extent. Various other typesof givc-and-take connections might be employed.

Again, it) Willbe readily understood that while l have shown thehydraulic hoist mounted directly on the truck or tractor of which theengine forms a part, it may in fact be vmounted. on an ordinary traileror on a semi-trailer resting upon or drawn by the self-propelledvehicle, the hot exhaust gases being passedto the hoist through a hosein aY A@il manner which will be obvious.

l claim:

1. A vehicle including an internal combustion engine having an exhaustconduit, a

hydraulic hoist on the vehicle adjacent said conduit,-jacket forming.means for a portion voit. the circulating system of the hoist, and aconduit forming a give-and-take connection between said exhaust conduitand said means whereby exhaust gases may be applied to heat the Workingliquid of the hoist.

2. A vehiclevcomprising a hydrauliclhoist including a hoisting cylinder,jacket forming means for a portion of said cylinder, a.

propelling engine for the vehicle, and means for directing hot fluidfrom the engine to,-

said' jacket forming means to Aheat the Working liquid in`said cylinder.

3. A vehicle including a propelling engine, an upright hydraulic hoistcarried by the vehicle, said hoist including a cylinder, a

jacket encircling the cylinder to form aheating chamber therefor nearthe base thereof,

and means for directing Waste heat from the engine to said jacket.

4. A` vehicle including al propelling engine having a conduit forlexhaust gases, a hydraulic hoist on the vehicle, a fitting secured onsaid conduit, anda llexible conduit forv directing hot fluid from saidfittingto said hoist to heat Working liquid for lthe latter to atemperature at which itiiovvsfreely.

GARFIELD A. Woon.

